LOCATION.-- Lat 42°25'09", long 88°07'33" (NAD of 1927), in SE1/4SE1/4 sec.36, T.46 N., R.9 E., Lake County, Hydrologic Unit 07120006, on east shore of Columbia Bay of Fox Lake, 2.5 mi west of Lake Villa.

PERIOD OF RECORD.--

STAGE:October 1939 to current year.

GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 733.00 ft above NGVD of 1929 (levels by Illinois Department of Transportation) (732.77 ft NAVD 1988). Prior to Dec. 15, 1939, nonrecording gage at same site at datum 2.26 ft higher. Dec. 15, 1939, to Sept. 30, 1971, at datum 2.26 ft higher.

REMARKS.-- Stage regulated by Stratton lock and Dam (previously known as McHenry Dam).

EXTREMES FOR PERIOD OF RECORD.--

STAGE: Maximum gage height, 8.18 ft, present datum, Apr. 6, 1960; minimum, 1.83 ft, present datum, Jan. 11-14, 16-18, 1968.